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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9540ee763dd6fb0f15cc64b5278708c6dd925ba252077db7ea6083456a1c9db6' 
  AND token = 'j3snac00tdGhhTR28C15JYrNc6nw6Cbk96jN7XjDmL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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