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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad5dd199d34466d9aa863094a2f5f0309eb7e33ae9b642317c1da5483a0cfd7' 
  AND token = 's1yywAeEac6D8QiNzsa9agf3hPIAICUpZ0wC1vPEvYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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