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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f7af84426b841ad24f121c4b2252eed40ce0a7688888de7ae41e4420fa7fe6' 
  AND token = 'y2L8RtLwEEhFrFCONPwp1qduckdK4PfDPm8telL7GyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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