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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41460fd1f6876fdf86a6fef11868e3c14448fb3448947c8c6592f28634e7bfe' 
  AND token = 'fYjf6zxWyrq3iWTmCitbGN4JPfjxJ6IgY8T7CEam+Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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