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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7092bed24a9863857886dd819b261d0d7f3071dd5628a25e14f1060e020f48d2' 
  AND token = 'bsVks6Ix/D0mz+c4WZAyNsxFzj47AB2eLpHrcrDtP3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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