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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10ae8b66346c4312c3a00326e0e7e0ad982e887b0eb0b4973889edb266e7309' 
  AND token = 'OWsQKqoGF45eyc0Bw0b3FvqguQ+doBqauDi8DLSAmls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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