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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fee70eecb62211a4a862372df3a56c33ec30b6c1b5295779daf301b106df6b0' 
  AND token = 'PTatEhSMWJ+mXu1mDVn7ay3igz1N0zJNliIDe/b3fBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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