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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48505398083977ef0e7fd27b156e3cf146c80178eb72aa2368d9b66054faff1' 
  AND token = 'cilSbBfe8mj6ClX3M/Aw2R3YV5/S0ELHXExUu00etTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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