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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090ecc850ac52131bec1893350afa92251de4c224f564bf7ec6276db5ffb1bbc' 
  AND token = '09O+XLlYRF/pbsluNR0wdz7IQoaxF7d0+aXPA8Ov758=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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