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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a71d507d10f61e65ec9d8886e3423b397385db79726a6b6b8b26c396537c21b' 
  AND token = 'Uc27lsJT5KIQgCpth7lZ36ucyKcX7MP1nqLrsKdSLcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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