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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516b5faac9bd0e60d3f20d177e6e4780cc0320703be1dd89625105398a84cbf8' 
  AND token = 'CtJerPLFvn8805RkA0oK+E0/YAHNIXJBuElsmhRS/Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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