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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33f642d64fd65ca723e7a28d57544cd98231371a5cb4b5c5d0c0df88f31d45e' 
  AND token = 'bUH55CoIknZqO1LYnTryhVOPHc5MZ0TKQWYoaStHQ7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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