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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae35f23f26e87c35c7a315d11da4bdfec02de8f479cade68d1da7336a9ba5e4' 
  AND token = 'l/yjr/h0w/FnHsAUkw/670EztmFNKNaYFKU7h3+eUvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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