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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec9c4d8e13ad8d4e01ac0124be004fca0d72b6513329739117febfe2f598622' 
  AND token = 'dZJi7IJgFCcXNaerN9e/MIP1nfDP48LWIMOwyUMgnY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00155

JSON explain

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