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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237927e75bf40945b02aa4c3128251d546039980c20bb9bcb71b6a69d6ac3b85' 
  AND token = '9AqyFoLOUqTk6tS1OFCWoGwq30f4ZcSwKRSKVHlnOpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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