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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df3a0b54f1921bf4c1790e33196a23c6b5e3156c18f92f2ca617c533c1f111d' 
  AND token = 'ukHX6qg6p5dUJmCKa5MJyKUHTyyTp8GInu5ubOyBjiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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