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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699b898e706a0b48eebf3cc0c5a59c9959468972906949ad3322836b71e4b87d' 
  AND token = 'dl0K9Q4B1KsfEwRbZP62QVFkJjitrqsml4/8mAlMw5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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