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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7dc6deb26b1c0a0b5cff9bf205478c82e235f1cc577fe5bba1691ded6be5bed' 
  AND token = '0vQACLwHb5b3pWw8s24KqLnA07kf888YXbNHJryaB1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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