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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ff30e986a5626a1d51eccafe2755ce40f0471b69a31890ccf130370e4a3b13' 
  AND token = 'a6Tt8dHlF0PIFAtza64nxLBAi5yNpLcilZgv7uTLNhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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