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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef4133db77077b8cb2ee0a16114f6678db9dbd72f0d6f682dcfb65e1167274b' 
  AND token = 'mnvTV93P7wd0qLhAK6459gMUcxLUBAI4P27TvQXvbk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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