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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee09a7bd55f4aff36a2db8ecc31809bbff8facffe1b597d0d2de0ae2a196de88' 
  AND token = '4zNpy72k9TzSZoMTT7udcfI7RojuQD6B16lV+N3OXpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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