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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f20a2c33b7431a4e46998eb0ea56c5620e58dbe26398ba36b8e25654e5eacc' 
  AND token = 'CCU97WfaX883R9p1tFFDRrVsWa/KSv3TEGJgcVI6a3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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