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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2f6158d75ae1d3ef4bc99b1ec46bcfed8b793a3ebd46bf2012fd1d0a223f88' 
  AND token = 'iB7CHo/30NmxtT/VJQonU09/ZpW4M/iQPhL0uX7HSMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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