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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a707fc878b7a7bf72bc0dde6e502e7c1b10b519e2d83f73658def9b849efc07' 
  AND token = '3R0YtBzmyg7s9JOsvmxKuHMMkOQ5QB5zDKl03AHR7+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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