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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2aa5fd69bddc9fb6894fd60ae814ca66758bbea7f593bbbaf674bfe07e937bd' 
  AND token = 'L/UogpwOeOuJFy3gUkzmYJ6/s38JbHxRXN/2q+MrO8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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