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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aecc55a0b48dd928a388f0b29df5ef5df77adc07ef35d4941a3809b1c260e0a4' 
  AND token = '9fGQHBm3/S8KX11tjdRgAvspDsxy2JocZ82xjl5QuoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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