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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56225752b96df13510bcd4fa7509ddab65864d3a0af8f4e925d8605cac5dbdb' 
  AND token = 'G5Pp04nHAH3oFzgOdYw1Z5kphoNNg68cDjCB6zv6O3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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