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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c7190213ac0a0f5fa4efd9e8b4511cfdc1bd6571ca2ef2247f65febd58bc9c' 
  AND token = 'vDBuZPor+eeapu4rgrO0NP2IrZBcflTmlyA1KTazsgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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