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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664e6133f5bbcc9176cc04fc11f8d14d988337aa0401dc11511de8a9ffb117df' 
  AND token = 'v+W0PlMFEu3iByeSRqNrNYHqU+/JjQp0A0MUjcMDwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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