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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96b1765124fb58d7841e7ffc818958ad2702011e8a63f4838a7b50443d032d2' 
  AND token = '+9CXqtG1jfI8A70/LDkALpPL9YU/m/tD/4/gX80HgK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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