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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70bd52e283384d06b0fe0e177088e76ee2b53cddae32e8f03bc5129f67503b6e' 
  AND token = 'WZYaIifoRXI/56j+g5KKqi1ajl4yC0nuA71qGT/6NKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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