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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228062908a9c6c1b6b8fb3e940454b231896a62aedbe63a4991daa835c575e9c' 
  AND token = 'F0OSKPIeo2wUA26luAPKOBIY6pyEFHcez2nJWAFG3Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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