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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1905ac1bf75652a52dccaa7167f814d582595669d9e5c7f4680ca0cdf82294' 
  AND token = 'a0LzVpdbTHJKDObQFIlcdL77TQy0cnUeqXk95zSVr4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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