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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10558e9124d14ec9a3a68679ecd7b83abc37cb5924d94730e563f408748cbc49' 
  AND token = 'iD3VVAcO28yoMbJddOxOwzorMpU+Xx9yfyWpeYAuLKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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