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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce54b099f98747741bf5ca186a1d62d338a9f6e1008cef94e2f86673699364c' 
  AND token = 'rrqWhsBjkAnQy4QV+RbdWci9WD+WgViXGkXU3kRSvng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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