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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ba44dd8f90ecf9f69173cb8b09804a1fc13ea0d1fc83f576f35a9d2915fb84' 
  AND token = 'KIDpFKLvA+5ZNrjmEoCeXHeKzaLcbBxRQz9fLjDbrlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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