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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652162ced6b2df65244ec61862e3f7544ae31e5732477f5cec53bc1f8ef01a03' 
  AND token = 'BbcLlkGng/NkL7sihEAiW6dADZXoTj5AhknV4TemGxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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