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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce44f40513c5e94f15c4ac7f88fe29feecae31e3725a5bdb8f8d1aebc3e32b1d' 
  AND token = 'R2FlOhGIKkmMp0UJIoDVFl8QxE+wojVW6vUpKJA4aqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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