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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b54a1afd32a6a79829be660291f2500e3eb4080cb3e8ff6d5c62b67bc0a1a0c' 
  AND token = '97WokILNAEuojiisvj1gBSde1FwUszvL426jUFJb9Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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