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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b47d5a1d74ab3e70906fd130d5a52940cdc654b20282a2b6831f9974f4e1b88' 
  AND token = '1tmtJPEbyXriBfafsovldMJ4hmWpXBW5UDpGLBVevpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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