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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620a13ad8d226078ec5d853160419fc33bac83ff26ef4762fe914b81114e5527' 
  AND token = 'MMUZaWBxKp1RTLtRuw474BVV/x5euC8p/8YZ84yzLRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}