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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0918dcc25de299beb758654c76d2149aef7220ca0f7c511430e485c58aa8c0a6' 
  AND token = 'REqwdnBengZXtI5jAN57E9iSdF9XEOVxnz6fPBDM+uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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