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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973b606b4ea191fb9bfe099f1c192c0b7be0a0f1b3431495f944e60a744450c1' 
  AND token = 'rX6MM4d9b2FEgpOzpReG6btgOibzbkxvGf+HGkeHjCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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