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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2023aface100e61481baf0541e2a66df3ad2ffaf4be4f88112d9ac8d676be73' 
  AND token = 'SodfwN/hzPukGp2v3HkdsHXfeihCgbRAA11JwV0eMuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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