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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f43c2e1994bc5302fc70b5ed9ac4cc8687c47f3a47d667c17b131a31b614a1' 
  AND token = 'K9JhnHlNDCdRP2MX396gjU7stSf8YJlq6QQHOeH+1gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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