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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ead723d7f5c6aa782b1bb63bd00038a9d02e7326214290eb9dccdfa8af391a6' 
  AND token = '26VohP7axunOBo68QVEWya7I9DX+0QT+oAMV6lUp6bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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