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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7a58cde2d2fbea50b5f9bd31bc9d23bf2826d63d5de5827b3329afd9a6181d' 
  AND token = 'bYHWaPZG0hukXFmvyEqLX5uThVwK/XG9Cb0/TtAYcqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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