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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de17d6a187e97150abe5d4532d9da267ed5e13e19b29aacc9ceae03f0e1d3a0' 
  AND token = 'PgKjm2aKaWq6bphiQdM06WfLBBJILo9gvk5SronG5sE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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