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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cd51db8b3b2d7be185158fd6af79c5cfeeb60b111763ff5a74a3bdc6e8383d' 
  AND token = '9YaZNrwJYPnsmAk4mC73+WcgTdU7y0OYxiRtM5QTezk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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