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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9016573d87739f4422d4bb459b146faee15c57e92920b67f9b09bcae586a2986' 
  AND token = 'II3ghGN412uEFrjdrYGzAniPL1yxSSw3I4EOZug+jL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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