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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb11100d902cb0782775d9a6f82946aaa1187592539cd7ab29c55b15259bacb' 
  AND token = '/aaPHN2XIppetatSbNGNZQsRSiDp02pzbRbg/fJ9+FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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