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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86bfc4a5f996e58583ed55834ecf90f86ff9fc18faef14e8404d30ee9dd62abe' 
  AND token = '0QcYjOqGESdF468sF2ujPQZJ1YfZUqM8q7o3fP0Ugfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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