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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48ffc2034d6ad494afab0204bf73c8ec19869cc05b346d6034a2b4b1fdfb94d' 
  AND token = 'diu7iZVnihHtJABMPBPBWUNJLc3fK8SavOcVaf3iMAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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