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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95071b5f5ec91b81e6064cc8ab25f9adf8f2f16864b345ff331b8c505a7a3628' 
  AND token = '5hLglOxcOsdu5HGQr+u6T03nydFbx4WrDLDvyC3hQAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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