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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d9c0abd2c843b1431c468fda4cc293ef3e13a3d8d2e79209d0ece3e6ae43aa' 
  AND token = 'aOs9D+4Ctb4QKNxF+AVYU8RsueHPWsaSSESEhsld7qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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