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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa060e086e978b03dd35625bd6db1474ce2faf8bcda4310a390ca9c038be54a' 
  AND token = 'Urj2ehiV1tVYATKpoBoRlJJertV8/dWO9wm4Ja0febg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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