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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87fc903390fed0ff4b8c782aee15a1ab7b2a1af6d2ebf45e5d3a724d7389dbc' 
  AND token = 'J6yNcrX5f+H+U6b8JfoQFUlQc+wE95s7c0B3T2c6vUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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