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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908c0cae9a92ad2d356f1433039a07027904bd25aa002198933559114c0dbeec' 
  AND token = 'uvW8HlzIPxOSczSaqabirNFz8r0Mg9srZUR/Cp9h90s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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