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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba81aef80e9590cfd302629114e81505be52189c3b92eccf4c947d8ca2bdda17' 
  AND token = 'xRU/ql61sQFtMuXWNxoyqHHond3lSqOENtzauQqy8+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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