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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3647f96a637f1b82bf7e47e22091258e13b7984f3be140f4a5de8d0ca9007e12' 
  AND token = 'b18vdOp8AEuC1TMOa8tWruFElckpT5HhulA6WoJqSgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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