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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd185c4dfc4d004248b4649d2d4819dd4b9c339302a1f96160069f8ccd572b05' 
  AND token = 'MALCI/3KGEsYvaYc+4nyeNXH8LfXAk+GW8mAJPIel4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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