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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ded59b0921c2f3e1194b4286e3860ab32b63f660ed198e526057da12ec1f047' 
  AND token = 'vCCDhD3diLtrxFChtP64Dpv2nYgYW0vP6ANnCvh3Qck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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