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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccb155925a32fefce8e4ff380890a5bf8184ec9b4fcd4377aaeb1a157dba993' 
  AND token = 'pcG6xWCKvglZAxGJXc7ZSUe+T3WpQUrXZojvSx0daao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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