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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07cf7311ff4be4cd6a54ccac3258f866ada39e44472ba8162a1bdfac08dcc49' 
  AND token = 'zTL7uqF60yGLRDYvOLdLKxXZWoPKfFEzDGcJ02LBUl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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