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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce8870f43fdd7907c3a59f3320054cfa6fa128edc1a98d1209090e96a863995' 
  AND token = '0HVLS6vSf6ihWTtOaljtkcQp/33umO7BmFqg0ruJi6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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