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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83c6befdb9894e5b9c6e5840b260b498844a8d96ca8ac93463c25c9669541f1' 
  AND token = 'lIt3AmXqPAi0EQZV8bGVqUasozjD/HNeSFcest0/gzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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