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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec634173bc76237139c04330c9e1ce993450cdd6fb164a338a7d52d124fdfb0' 
  AND token = 'm/x/wRAYpmo2WKEw9/jBXTMyCamm3vu8WfI61FBBR/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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